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  4. cos2 (π/16)+cos2 (3π/16)+cos2 (7π/16)=

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Q. $cos^{2} \, \frac{\pi}{16}+cos^{2} \, \frac{3\pi}{16}+cos^{2}\, \frac{7\pi}{16}=$

Odisha JEEOdisha JEE 2008Trigonometric Functions

Solution:

Correct answer is (c) $2$